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31 lines
1.1 KiB
Scala
31 lines
1.1 KiB
Scala
package com.twitter.home_mixer.functional_component.candidate_source
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import com.google.inject.name.Named
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import com.twitter.finagle.memcached.{Client => MemcachedClient}
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import com.twitter.home_mixer.param.HomeMixerInjectionNames.StaleTweetsCache
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import com.twitter.product_mixer.core.functional_component.candidate_source.CandidateSource
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import com.twitter.product_mixer.core.model.common.identifier.CandidateSourceIdentifier
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import com.twitter.stitch.Stitch
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import javax.inject.Inject
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import javax.inject.Singleton
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@Singleton
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class StaleTweetsCacheCandidateSource @Inject() (
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@Named(StaleTweetsCache) staleTweetsCache: MemcachedClient)
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extends CandidateSource[Seq[Long], Long] {
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override val identifier: CandidateSourceIdentifier = CandidateSourceIdentifier("StaleTweetsCache")
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private val StaleTweetsCacheKeyPrefix = "v1_"
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override def apply(request: Seq[Long]): Stitch[Seq[Long]] = {
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val keys = request.map(StaleTweetsCacheKeyPrefix + _)
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Stitch.callFuture(staleTweetsCache.get(keys).map { tweets =>
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tweets.map {
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case (k, _) => k.replaceFirst(StaleTweetsCacheKeyPrefix, "").toLong
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}.toSeq
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})
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}
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}
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